Gates a



(No Model.)

G. A. OLARK GOKING FURNAGE.

g Patented Nov. 12, 1889.

' 4 UNITED STATES PATENT OFFICE- GATES A. CLARK, or noonnsrnannw YoRmAssIeNoR T THETCLARKS COKING AND SMOKELESS FURNACE COMPANY, OF SAME PLACE.

COKlNG FURNACE.

SPECIFICATION forming part of Letters Patent No. 415,022, dated November 12, 1889.

Application filed April 30, 1888. Serial No. 272,292. (No model.)

vTo all whom, it may concern.-

. Be it known that I, GATES A. CLARK, of Rochester, in the county of Monroe and State of New York, have invented an Improvement in Coking-Furnaces, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention 'relates to coking-furnaces of that class in which soft or bituminous coal, wood, or other carbonaceous material is coked and the volatile products driven off by heat caused to pass up through the fire-bed to assist in combustion, and to obtain a maximum amount of heat from the said coal or other material.

This invention is an improvement upon the coking-furnace shown and described in another application, Serial No.' 260,976, filed by me January 17, 1888, and has for one of its objects to provide the wall of the furnaceexposed to the heat in the fire-box or combustion-chamber with a water-back divided into two cha1nbers,.and preferably connected 'to the boiler, to establish and maintain a circulation of water or other fluid first through one chamber and then through the other chamber, whereby the water is maintained a substantially long time in contact with the metal water-back, and the latter is most thoroughly protected and the life of the said wall is prolonged.

Another feature of my invention consists in providing a damper 01'' valve adapted to close the outlet or opening connecting the chute or chamber containing the coal with the fire-box, whereby the volatile products in the coal are, prevented from being drawn through the said opening directly into the fire-box, thereby causing all or substantially all the volatile products to pass up through the fire-bed, thus obtaining a greater heating effect than was hitherto possible.

.The particular features in which my invention consists will be pointed out in the claims at the end of this'specification.

- Figure 1 is a vertical transverse sectionof a sufficient portion of a furnace to enable my invention to be understood, the section being taken on line 00 00, Fig. 2; and Fig. 2, a horizontal section of the furnace shown in Fig. 1 on-line 0c 00', y

The furnace A, of brick or other suitable material, and having the fire-box or combustion chamber a, provided with the usual grate-bars a, contains a boiler (0 supported at one end by the rear wall a of the combustion-chamber, the said boiler being herein shown as a fire-tube boiler.

The furnace -A is provided with a wall (0*, of fire-brick or other refractory material, extended the length of the combustion-chamber and supported, as shown, by the front casting or wall a of the furnace and the wall a The wall a rests upon a hollow metallic casting 1), preferably supported by the front wall a and the wall a and divided, as shown, by the wall 1) into two chambers 12 b communicating together preferablynear the front end of the said casting. The wall a supports, as herein shown, a T- rail bflnpon which rests an arch b of brick or other material, the sa id arch forming, with the wall a and side wall of the furnace, a chamber, which is divided longitudinally, as shown, by plates b secured together by bolts 5 into a chute or chamber 19 into which the coal or other material is supplied through a suitable door d (shown by dotted lines in Fig. 1) and a passage b the plate I) being inclined toward the plate U The coal or other material to be coked falls upon auxiliary'grate-bars 0,. supported,-as shown, on a box c',-forming an auxiliary ashpit, provided with a suitable door 0 by opening which a draft may be furnished to the chute.

The metallic casting I) does not extend to the grate-bars a, but is supported above the said bars a sufficient distance to leave an outlet or discharge opening a through which the coal or other material resting upon the auxiliary grate-bars, and which has been coked, may be fed or discharged into the firebox by a plunger or feeder, shown as a box or frame a, secured to a carriage 0 having, as herein shown, at suitable distances apart, rack-bars 0 having in mesh with them gears c on a shaft 0 extended outside the furnacewall and provided, as shown, with a suitable handle or crank 0 by which to rotate said shaft, the said carriage being guided, as shown, by suitable rollers or wheels 0 The auxiliary grate, as Si1OWD,'lS provided with suitable openings or spaces d, (see Fig. 2,) for the passage of the rack-bars c as the plunger or feeder is moved forward to discharge the coke into the fire-box.

The chambers b b in the metallic casting are connected at one end of the said casting with the boiler by pipes c 6, respectively, the pipe 6, as shown, being connected to the bottom or lower part of the boiler and the pipe 6 to the upper part, so that the heavier or cold water or fluid at the bottoin of the boiler may flow through the pipe into the chamber b and thence into the chamber Z1 from whence it is forced through the pipe 6 into the boiler above the cold-water line. It will thus be seen that the metallic casting 1) forms a water-back, through whicha circula tion of water is maintained, the said water reducing the temperature of the casting, preventing it from being burned out, and thereby prolonging the life of the furnace, at the same time enabling steam to be generated in the boiler in a shorter time.

To prevent the volatile products from be ingdrawn directly from the chute into the fire-box through the opening 0 which might occur when the draft is substantially strong, I have provided a damper or valve f, of firebrick or other refractory material, located, as shown, below and substantially in line with the water back and movable in suitable guides f secured to the walls of the furnace between the box 0' and the grate-bars Ct, the said valve or damperbeingmovable, as shown, by gears f 011 a shaft f and in mesh with rack-bars 1, attached to the said damper or valve, the said shaft being rotated from out side the furnace in any suitable manner.

hen the damper or valve f is closed, the volatile products in the coal or other material to be coked, and which are driven off by heat, are caused to pass up through the chute I)", through the passage b and up through the grate-bars a and fire-bed thereon, as indicated byarrows in Fig. 1, thus obtaining a maximum yield of heat.

To expedite the coking process the door a? or a damper therein may be opened. 3

I prefer to connect the water-back with the boiler; but it is evident that the said waterback may be connected with a reservoir or other source of supply located outside the f urnace. By dividing the water-back into two chambers and causing the water to flow throughone and then through the other of said chambers the said water is maintained for a longer time in contact with the metal water-back, and the latter is thereby most effectually protected.

I claim- 1. In a coking-furnace, the combination, with the wall between the main furnace and the coking-furnace exposed to the heat in the fire-box or combustion-chamber, of a waterback supporting said wall and composed of a casting having the dividing-wall b to form chambers b 12 communicating with each other and connected to the boiler to establish and maintain a circulation of water or other fluid, substantially as described.

2. Ina coking-furnace, the combination,

with a fire-box and a grate therein, of a wall -below-the grate, and a valve or damper to close the opening 0 substantially as described.

4. In a coking-furnace, the combination, witlra fire-box and-grate therein, of a dividing-wall provided with a Water-back located above the grate to form a discharge outlet or openingga chute or chamber to receive the material to be coked,a flue or passage connecting said chute with the firebox below the grate,a plunger or feederto discharge the material into the fire-box; and a valve or damper to close the said discharge outlet or opening, substantially as described.

5. In a coking-furnace, a fire-box, a grate therein, a boiler, a dividing-wall provided with a water-back connected to said boiler, a dividing-plate forming with said wall a chute or chamber to receive the material to be coked, and a flue or passage for the volatile products contained in said material combined with a plunger or feeder to discharge the coke into the fire-box, substantially as described.

6. Ina coking-furnace, a fire-box, a grate therein, a boiler, a dividing-wall provided with a water-back connected to said boiler, a dividing-plate forming with i said wall a chute or chamber to receive the material to be coked, and a flue or passage for the volatile products contained in said material, combined with a plunger or feeder to discharge the'coke into the'fire-box and with a valve or damper to close said discharge-outlet, substantially as described.

7. 111 a coking-furnace, the combination, with a fire-box and a grate therein, of a wall a, located in the fire-box and forming with the side wall of the furnace a chute or chamber to receive. the material to be coked, a flue or passage connecting said chute with the firebox below the grate, and a Water-back forming part of the wall a and provided with a water inlet and outlet, bywhich circulation of water or other fluid may be maintained through the waterback, substantially as and for the purpose specified.

S. In a coking-furnace, the combination, with a combustion-chamber and grate-bars therein, of a coking-oven provided with a flue connecting said oven with the combustionchamber below the grate-bars, a wall a, separating said oven and chamber, and a waterback supporting said wall and connected to the boiler to establish and to maintain a circulation of water or other fluid through the water-back, substantially as described.

9. In a coking-furnace, the combination, with a combustion-chamber and grate-bars therein, of acoking-oven provided with aliue connecting said oven with the combustionchamber below the grate-bars, a wall a, separating said oven and chamber, and a waterback supporting said wall and composed of a metal casting having a dividing-wall b to form chambers 19 b connected to the boiler to establish and to maintain a circulation of water or other fluid through the water-back, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

' GATES A. CLARK.

Witnesses:

WALTER H. ToBEY, CHARLES N. PRATT. 

